US1531348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sediment scraper for water heaters
Assignee: Individual
•
Filing: 1922-05-17
•
Granted: 1925-03-31
•
Expires: 1942-05-17
Abstract
No abstract record available.
Inventors
- 👤 Richardson Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:05
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/0005; F24H9/0042; F24H1/00; F24H1/18; F24H1/20; F24H1/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1928-03-30 | 1928-09-29 | 1929-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-03-30 | 1932-09-29 | 1933-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-03-30 | 1936-09-29 | 1937-03-31 | $7700.00 | Window Closed / Lapsed |